Related by context. Frequent words. (Click for all words.) 57 hydrocarbons 57 hydrates 56 subsurface 55 hydrocarbon 54 geological formations 54 methane 51 permafrost 50 Arctic Ocean 50 sedimentary rock 50 hydrocarbon reserves 50 seafloor 50 hydrothermal vents 49 rocky planets 49 meltwater 49 shale deposits 49 olivine 49 shale 49 sediments 48 seabed 48 gas condensate 48 ice crystals 48 carbonates 48 coal seams 48 volcanism 48 condensates 48 diatoms 47 Bakken formation 47 shale formations 47 polar regions 47 oceanographers 47 Tcf 47 crustal 47 shales 47 marine organisms 46 tcf 46 IPY 46 earth crust 46 Antarctic ice 46 shale gas 46 basins 46 Beaufort Sea 46 coalbed methane 46 Arctic 46 liquid hydrocarbons 46 Greenland ice 46 trillion cubic feet 46 Barents Sea 46 EOR 46 geologic formations 46 Antarctic 45 Chukchi Sea 45 sediment 45 Antarctica 45 organic molecules 45 recoverable reserves 45 Antarctic Ice 45 wellbore 45 Chukchi seas 45 undersea 45 deepwater 45 subduction zone 45 trillion cubic meters 45 Geophysical Research 45 subduction zones 45 deuterium 44 Earth crust 44 geoscientists 44 liquid hydrocarbon 44 continental shelf 44 microbes 44 sedimentary 44 seawater 44 microorganisms 44 calcite 44 seamounts 44 gasfield 44 geologically 44 geologic 44 Nature Geoscience 44 greenhouse warming 44 sedimentary rocks 44 atmospheric carbon dioxide 43 ultra deepwater 43 oceanic 43 algae 43 water vapor 43 hydrothermal 43 Shtokman gas 43 recoverable 43 geophysicists 43 shallow depths 43 containment dome 43 basalt 43 Shale Gas 43 Enceladus 43 Shtokman 43 Methane 43 ocean acidification 43 Martian soil 43 Norwegian continental shelf 43 geological